Pinch valve

Abstract

The utility model discloses a pinch valve which comprises a shell, a motor and a cam assembly, and the shell is provided with an abutting plate and a positioning groove used for containing a hose. The motor is installed on the shell through a connecting plate, a protruding block located in the shell is arranged on the connecting plate, and a through hole is formed in the protruding block. The cam assembly comprises a cam arranged at the output end of the motor, a driven block capable of abutting against the cam, a sliding rod connected to the driven block and arranged in the through hole in a penetrating mode and a pipe pressing head connected to the sliding rod through a connecting piece, the abutting plate and the pipe pressing head are oppositely arranged on the two sides of the hose, and the motor connected to the shell through the connecting plate can drive the cam to rotate. By means of the arrangement, the hose pressing head connected to the sliding rod through the connecting piece can press the hose to the abutting plate and is used for temporarily stopping blood circulation and preventing bubbles from entering the human body, through the arrangement, the hose can be continuously pressed by the hose pressing head only by electrifying the motor with small current and keeping torque, and the problems that a hose clamping valve is large in power consumption and serious in heating can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a pinch valve. Background Art

[0002] Blood purification refers to drawing the patient's blood out of the body and passing it through some kind of blood purification equipment to remove certain pathogenic substances (toxins) in order to purify the blood. Blood purification includes hemodialysis, hemofiltration, hemoperfusion, blood exchange, immunoadsorption, etc.

[0003] During blood purification treatment, certain instruments and equipment are used to draw the patient's blood out of the body, and after a certain procedure, certain metabolic wastes or toxic substances in the body are removed, and then the blood is drawn back into the body. During the extracorporeal circulation of blood, bubbles may enter the blood pipeline and other conditions that affect the safety of treatment may occur. In order to ensure the safety of treatment, during the blood purification treatment, when a bubble alarm is detected in the venous blood pipeline returning to the patient or other alarms that affect the safety of treatment occur, the venous clamp will pop out and clamp the pipeline to prevent bubbles from entering the human body. The clamp valve components do not contact the medium, and can achieve zero pollution to the medium. Therefore, it is widely used in medical industries such as blood purification. The clamp valve is an indispensable independent unit in blood purification equipment.

[0004] At present, the commonly used driving method of the clamp valve in the field of blood purification is electromagnetic drive, which uses electromagnetic characteristics to realize the extension and retraction of the moving iron core by powering on and off. When power is on, the moving iron core extends to clamp the pipeline, and retracts to open the pipeline when power is off. This method consumes large power and has low energy conversion efficiency. When the pipeline needs to be clamped for a long time, the electromagnet will heat up very seriously due to long-term power-on, which may cause safety hazards. There is also a lot of noise when it is attracted and opened, which is not suitable for use in wards. In addition, due to the short stroke of the moving iron core, the applicable pipeline specifications are relatively limited.

[0005] Therefore, how to provide a pinch valve to at least partially solve the above-mentioned drawbacks is a technical problem that those skilled in the art currently need to solve. Utility Model Content

[0006] The utility model aims to provide a pinch valve, which can avoid the problems of high power consumption and severe heating of the pinch valve.

[0007] To achieve the above object, the utility model provides a pinch valve, comprising:

[0008] A housing, provided with an abutment plate and a positioning groove for accommodating a hose;

[0009] The motor is mounted on the housing through a connecting plate, the connecting plate is provided with a convex block located inside the housing, and the convex block is provided with a through hole;

[0010] The cam assembly includes a cam arranged at the output end of the motor, a follower block that can abut against the cam, a sliding rod connected to the follower block and passed through a through hole, and a tube pressing head connected to the sliding rod through a connecting piece. The abutment plate and the tube pressing head are arranged on both sides of the hose so that the cam driven by the motor can drive the tube pressing head to press the hose to the abutment plate.

[0011] Preferably, it also includes a first detector and a second detector for detecting the position of the pipe crimping head, and the first detector and the second detector are both electrically connected to the central control system;

[0012] When the pipe pressing head presses the hose, the first detector can detect the position of the pipe pressing head close to one end of the abutment plate and feed back the signal to the central control system;

[0013] When the crimping head releases the hose, the second detector can detect the position of the crimping head away from one end of the abutment plate and feed back a signal to the central control system.

[0014] Preferably, the driven block and the connecting piece are respectively located at two ends of the slide rod, an elastic piece is provided between the protrusion and the connecting piece, and the elastic piece is sleeved on the outer periphery of the slide rod to drive the connecting piece to move in a direction away from the driven block on the axis of the slide rod.

[0015] Preferably, there are two protrusions and they are spaced apart in an upper and lower manner, there are two sliding rods and they are parallel to each other, the driven block is in a convex shape, including an abutment portion with a smaller cross-sectional area perpendicular to the axis of the sliding rod and a connecting portion with a larger cross-sectional area, the abutment portion is used for sliding connection with the protrusion, the connecting portion is used for connecting the two sliding rods, and a buffer block for buffering is provided between the connecting portion and the protrusion.

[0016] Preferably, the elastic member is a spring, the protrusion is provided with a first abutting surface for abutting the spring, the connecting member is provided with a second abutting surface for abutting the spring, the first abutting surface and the second abutting surface are parallel to each other and are respectively located at two ends of the spring.

[0017] Preferably, the motor is connected to a connecting block, the connecting plate is connected to a connecting shaft, and one end of the connecting block facing away from the motor is connected to one end of the connecting shaft facing away from the connecting plate, so that the motor is fixed relative to the connecting plate.

[0018] Preferably, the motor is a stepper motor, and the cam is fixedly connected to the output shaft of the stepper motor, so that the cam driven by the output shaft can abut against the abutment portion.

[0019] Preferably, a linear bearing is provided inside the through hole so that the slide bar can slide along its own axis relative to the protrusion.

[0020] Preferably, one end of the pressure tube head close to the driven block is a tapered structure, and the cross-sectional area of ​​the tapered structure perpendicular to the axis of the slide rod gradually decreases in the direction close to the driven block.

[0021] Preferably, the driven block, the sliding rod and the connecting piece are relatively detachable.

[0022] Compared with the above-mentioned background technology, the tube clamping valve provided by the utility model includes a shell, a motor and a cam assembly, the shell is provided with an abutment plate and a positioning groove for accommodating a hose; the motor is installed on the shell through a connecting plate, the connecting plate is provided with a protrusion located inside the shell, and the protrusion is provided with a through hole; the cam assembly includes a cam arranged at the output end of the motor, a driven block capable of abutting the cam, a sliding rod connected to the driven block and passing through the through hole, and a tube pressing head connected to the sliding rod through a connecting piece, the abutment plate and the tube pressing head are arranged on both sides of the hose, so that the cam driven by the motor can drive the tube pressing head to press the hose to the abutment plate.

[0023] Specifically, the positioning groove provided in the shell makes the hose passing through the shell relatively fixed for blood circulation. The motor connected to the shell through the connecting plate can drive the cam to rotate, so that the driven block slidably connected to the cam drives the sliding rod passing through the protrusion to move along the extension direction of the sliding rod, and then the tube pressing head connected to the sliding rod through the connecting piece can press the hose to the abutment plate, which is used to temporarily stop blood circulation and prevent bubbles from entering the human body. With this arrangement, the tube pressing head can continuously press the hose by energizing the motor with a small current to maintain the torque, which can avoid the problems of high power consumption and severe heat generation of the tube clamping valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the overall structure of the pinch valve provided by an embodiment of the utility model;

[0026] Figure 2 A schematic diagram of the structure of a cam assembly provided by an embodiment of the utility model;

[0027] Figure 3 A schematic diagram of the structure of the connecting plate provided in an embodiment of the utility model;

[0028] Figure 4 A partial cross-sectional view of a pinch valve provided by an embodiment of the utility model;

[0029] Figure 5 A partial cross-sectional view from another perspective of the pinch valve provided by an embodiment of the utility model.

[0030] in:

[0031] 1-housing, 11-abutment plate;

[0032] 2-Hose;

[0033] 3-motor, 31-connecting plate, 32-bump, 33-connecting block, 34-connecting shaft;

[0034] 4- Cam;

[0035] 5-driven block, 51-abutting portion, 52-connecting portion, 53-buffer block;

[0036] 6-sliding rod, 61-elastic member;

[0037] 7-Connecting parts;

[0038] 8-Pipe pressing head;

[0039] 9- a first detector;

[0040] 10- Second detector. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] In the description of the present invention, it should be understood that the terms "upper" and "lower" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the position or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of the present invention.

[0044] The utility model aims to provide a pinch valve, which can avoid the problems of high power consumption and serious heat generation of the pinch valve, can reduce the noise of the pinch valve when it is clamped and released, and increase the stroke of the pinch valve to be suitable for hoses of various specifications.

[0045] See also Figure 1 To achieve the above-mentioned purpose, the utility model provides a pinch valve, a housing 1, a motor 3 and a cam assembly.

[0046] The shell 1 is provided with an abutment plate 11 and a positioning groove for accommodating a hose 2. The positioning groove enables the vertically extending hose 2 to pass through the shell 1. The hose 2 is detachable relative to the shell 1 so that hoses 2 of different specifications for blood circulation are suitable for the shell 1. The abutment plate 11 is arranged inside the shell 1 and is adjacent to the above-mentioned hose 2.

[0047] The motor 3 is connected to a connecting block 33, the connecting plate 31 is connected to a connecting shaft 34, and the end of the connecting block 33 facing away from the motor 3 is connected to the end of the connecting shaft 34 facing away from the connecting plate 31, so that the motor 3 is fixed relative to the connecting plate 31, and the connecting plate 31 is provided with a protrusion 32 located inside the shell 1, and the protrusion 32 is provided with a through hole.

[0048] See also Figure 2 The cam assembly includes a cam 4 arranged at the output end of the motor 3, a follower block 5 that can abut against the cam 4, a slide rod 6 connected to the follower block 5 and passed through the through hole, and a tube pressing head 8 connected to the slide rod 6 through a connector 7. The abutment plate 11 and the tube pressing head 8 are arranged on both sides of the hose 2, so that the cam 4 driven by the motor 3 can rotate, thereby driving the tube pressing head 8 to press the hose 2 to the abutment plate 11.

[0049] The positioning groove provided in the shell 1 makes the hose 2 passing through the shell 1 relatively fixed for blood circulation. The motor 3 connected to the shell 1 through the connecting plate 31 can drive the cam 4 to rotate, so that the driven block 5 slidably connected to the cam 4 drives the slide bar 6 passing through the protrusion 32 to move along the extension direction of the slide bar 6, and then the tube pressing head 8 connected to the slide bar 6 through the connecting piece 7 can press the hose 2 to the abutment plate 11, which is used to temporarily stop the blood circulation and prevent bubbles from entering the human body. With such a configuration, the motor 3 can be energized with a small current to maintain the torque so that the tube pressing head 8 can continuously press the hose 2, which can avoid the problems of high power consumption and severe heat generation of the clamping valve.

[0050] See also Figure 3 and Figure 4 The clamp valve also includes a first detector 9 and a second detector 10 for detecting the position of the clamp head 8, and the first detector 9 and the second detector 10 are both electrically connected to the central control system; and preferably, the first detector 9 and the second detector 10 are arranged in a groove in the connecting plate 31. When the clamp head 8 clamps the hose 2, the first detector 9 can detect the position of the clamp head 8 close to one end of the abutment plate 11 and feed back the signal to the central control system; when the clamp head 8 releases the hose 2, the second detector 10 can detect the position of the clamp head 8 away from one end of the abutment plate 11 and feed back the signal to the central control system.

[0051] Among them, the central control system is provided with preset values ​​for the positions of the two ends of the pressing head 8 on the axis of the slide bar 6. For example: when the pressing head 8 presses the hose 2, if the distance between the pressing head 8 and the abutment plate 11 is less than the first preset value, it is deemed that the pressing head 8 is clamped in place and the hose 2 is temporarily interrupted from flowing; if the distance between the pressing head 8 and the abutment plate 11 is not less than the first preset value, it is deemed that the pressing head 8 is not clamped in place, and the central control system sends out an early warning signal to remind the staff to pay attention and perform manual operation until the distance between the pressing head 8 and the abutment plate 11 is less than the first preset value and the early warning signal disappears. Correspondingly, the distance between the end of the pressing head 8 away from the abutment plate 11 and the side plate close to the shell 1 can be set to a second preset value accordingly, which is used for the central control system to obtain whether the pressing head 8 has completely loosened the hose 2.

[0052] In addition, a detection element can be set as needed to detect whether there is liquid flowing in the hose 2, and the information can be fed back to the central control system in real time to verify whether the clamping head 8 can achieve the expected effect when clamping the hose 2. Through signal feedback, the accuracy of each state is ensured, making the use of the clamp valve safer.

[0053] In some embodiments, the follower block 5 and the connecting member 7 are respectively located at the two ends of the sliding rod 6, an elastic member 61 is provided between the protrusion 32 and the connecting member 7, and the elastic member 61 is sleeved on the outer periphery of the sliding rod 6 to drive the connecting member 7 to move in the direction away from the follower block 5 on the axis of the sliding rod 6. The elastic member 61 is preferably a spring, and the protrusion 32 is provided with a first abutting surface for spring abutment, and the connecting member 7 is provided with a second abutting surface for spring abutment. The first abutting surface and the second abutting surface are parallel to each other and are respectively located at the two ends of the spring.

[0054] When the motor 3 is not working, the hose 2 is in a released state. When the motor 3 is working, the follower block 5 driven by the cam 4 drives the connector 7 to move axially along the slide rod 6. The second abutment surface of the connector 7 will compress the spring between the connector 7 and the protrusion 32, and the tube pressing head 8 presses the hose 2. The spring is in a force storage state and the hose 2 is clamped. When the motor 3 rotates in the opposite direction or an unexpected situation such as a sudden power outage occurs, the spring in the force storage state drives the connector 7 to move in the opposite direction mentioned above, so that the tube pressing head 8 moves away from the hose 2, the spring returns to its initial state and the hose 2 is released. With this arrangement, when an unexpected situation such as a sudden power outage occurs, the connector 7 can be rebounded to its original position by the spring, driving the tube pressing head 8 to release the hose 2, so that the clamp valve automatically opens, thereby ensuring the use of the clamp valve in the blood purification industry.

[0055] Among them, the protrusion 32 is provided with a first abutting surface for abutting the spring. The first abutting surface and the second abutting surface are parallel to each other and are respectively located at two ends of the spring to realize the compression and recovery process of the spring. The two ends of the spring can also be fixedly connected to the first abutting surface and the second abutting surface as needed to prevent the spring from failing to abut in place.

[0056] In addition, it is preferred that the slide rod 6 and the driven block 5 and the slide rod 6 and the connecting piece 7 are connected by screws so that the driven block 5, the slide rod 6 and the connecting piece 7 are relatively detachable, and the length of the disassembled slide rod 6 can be adjusted according to actual needs to adapt to hoses 2 of different specifications.

[0057] See also Figure 5 In some embodiments, there are two protrusions 32 spaced apart from each other, there are two sliding bars 6 parallel to each other, the follower block 5 is convex-shaped, including a contact portion 51 with a smaller cross-sectional area perpendicular to the axis of the sliding bar 6 and a connecting portion 52 with a larger cross-sectional area, the contact portion 51 is used for sliding connection with the protrusion 32, and the connecting portion 52 is used for connecting the two sliding bars 6.

[0058] The connecting portion 52 of the driven block 5 is simultaneously connected to two parallel sliding bars 6, and the two sliding bars 6 are respectively passed through two protrusions 32 spaced apart in the upper and lower directions, so that the positions of the two sliding bars 6 are relatively fixed (the sliding bars 6 will not rotate around their own axes) during the movement of the driven block 5, thereby reducing or even avoiding the movement error of the connecting member 7 connected to the two sliding bars 6, so that the pipe pressing head 8 connected to the connecting member 7 can be accurately moved. Compared with the matching mode of a single sliding bar 6 and the protrusion 32, this embodiment can avoid the rotation of the sliding bar 6 around its own axis during the movement, thereby avoiding the situation where the pipe pressing head 8 used to clamp one end of the hose 2 rotates and the hose 2 cannot be clamped.

[0059] A buffer block 53 for buffering is provided between the connecting portion 52 and the protrusion 32 of the driven block 5, which can avoid collision when the connecting portion 52 and the protrusion 32 come into contact, reduce wear of components and reduce noise. The buffer block 53 can be arranged on the side facing the connecting portion 52 and / or the protrusion 32, and is not specifically limited here, as long as the above purpose can be achieved.

[0060] In some embodiments, the motor 3 is preferably a stepper motor, and the cam 4 is fixedly connected to the output shaft of the stepper motor, so that the cam 4 driven by the output shaft can abut against the abutment portion 51 .

[0061] When the stepper motor rotates forward, the cam 4 is driven to rotate by the stepper motor, thereby pushing the tube pressing head 8 to slide forward to clamp the hose 2. When the stepper motor rotates reversely or an unexpected situation such as a power outage occurs, the tube pressing head 8 is rebounded to its original position by a spring, and the tube clamping valve opens. The forward and reverse rotation process of the stepper motor is only used to distinguish the rotation direction of the output shaft.

[0062] In addition, a linear bearing is provided inside the through hole so that the slide rod 6 can slide along its own axis relative to the protrusion 32. The linear bearing can reduce the wear of the slide rod 6 during the movement relative to the protrusion 32, thereby increasing the service life of the slide rod 6.

[0063] In this embodiment, the end of the crimping head 8 close to the driven block 5 is preferably a tapered structure, and the cross-sectional area of ​​the tapered structure perpendicular to the axis of the slide rod 6 gradually decreases in the direction close to the driven block 5. By reducing the area of ​​the side of the crimping head 8 close to the hose 2, the pressure of the crimping head 8 on the hose 2 can be increased, and the clamping process of the hose 2 can be better achieved.

[0064] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0065] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0066] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the utility model.

Claims

1. A pinch valve, characterized in that: include: A housing (1) is provided with an abutment plate (11) and a positioning groove for accommodating a hose (2); The motor (3) is mounted on the housing (1) via a connecting plate (31), the connecting plate (31) being provided with a convex block (32) located inside the housing (1), the convex block (32) being provided with a through hole; The cam assembly comprises a cam (4) arranged at the output end of the motor (3), a follower block (5) capable of abutting against the cam (4), a slide rod (6) connected to the follower block (5) and passing through the through hole, and a tube pressing head (8) connected to the slide rod (6) via a connecting member (7), wherein the abutment plate (11) and the tube pressing head (8) are arranged on both sides of the hose (2) so that the cam (4) driven by the motor (3) can drive the tube pressing head (8) to press the hose (2) against the abutment plate (11).

2. The pinch valve according to claim 1, characterized in that It also includes a first detector (9) and a second detector (10) for detecting the position of the pipe pressing head (8), wherein the first detector (9) and the second detector (10) are both electrically connected to the central control system; When the tube pressing head (8) presses the hose (2), the first detector (9) can detect the position of the tube pressing head (8) close to one end of the abutment plate (11) and feed back a signal to the central control system; When the tube pressing head (8) releases the hose (2), the second detector (10) can detect the position of the tube pressing head (8) away from one end of the abutment plate (11), and feed back a signal to the central control system.

3. The pinch valve according to claim 1, characterized in that The driven block (5) and the connecting member (7) are respectively located at two ends of the slide rod (6); an elastic member (61) is provided between the protrusion (32) and the connecting member (7); and the elastic member (61) is sleeved on the outer periphery of the slide rod (6) to drive the connecting member (7) to move in a direction away from the driven block (5) on the axis of the slide rod (6).

4. The pinch valve according to claim 1, wherein: There are two protrusions (32) arranged at intervals in the upper and lower parts, there are two slide bars (6) parallel to each other, the driven block (5) is in the shape of a convex character, and comprises an abutment portion (51) with a smaller cross-sectional area and a connection portion (52) with a larger cross-sectional area perpendicular to the axis of the slide bar (6), the abutment portion (51) is used for sliding connection with the protrusion (32), the connection portion (52) is used for connecting the two slide bars (6), and a buffer block (53) for buffering is provided between the connection portion (52) and the protrusion (32).

5. The pinch valve according to claim 3, characterized in that The elastic member (61) is specifically a spring, and the protrusion (32) is provided with a first abutting surface for abutting the spring, and the connecting member (7) is provided with a second abutting surface for abutting the spring, the first abutting surface and the second abutting surface are parallel to each other and are respectively located at two ends of the spring.

6. The pinch valve according to claim 1, wherein: The motor (3) is connected to a connecting block (33), the connecting plate (31) is connected to a connecting shaft (34), and one end of the connecting block (33) facing away from the motor (3) is connected to one end of the connecting shaft (34) facing away from the connecting plate (31), so that the motor (3) is fixed relative to the connecting plate (31).

7. The pinch valve according to claim 4, characterized in that The motor (3) is specifically a stepping motor, and the cam (4) is fixedly connected to the output shaft of the stepping motor, so that the cam (4) driven by the output shaft can abut against the abutting portion (51).

8. The pinch valve according to claim 1, wherein: A linear bearing is provided inside the through hole so that the sliding rod (6) can slide along its own axis relative to the protrusion (32).

9. The pinch valve according to claim 1, wherein: One end of the pressing tube head (8) close to the driven block (5) is a tapered structure, and the cross-sectional area of ​​the tapered structure perpendicular to the axis of the slide rod (6) gradually decreases in a direction close to the driven block (5).

10. The pinch valve according to any one of claims 1 to 9, characterized in that The driven block (5), the sliding rod (6) and the connecting piece (7) are detachably connected.

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